I made a LAN world for my friend but on the other laptop it can't scan any LAN worlds and when I click open to LAN it shows 0.0.0.0 [port] and I tried using direct connect but it said "unknown host.
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41st Duplicate of MC-2583, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Firewall? If you're using a third-party firewall (not MS Windows integrated firewall) look on their site, they should provide info on how to add an exception, do this on both machines. Windows Firewall should pop up a dialog asking for your permission to bypass the firewall, say yes, and enter your admin credentials.